001 /**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.xbean.classloader;
018
019 import java.net.URL;
020 import java.net.URLClassLoader;
021 import java.net.URLStreamHandlerFactory;
022 import java.util.Arrays;
023
024
025 /**
026 * The NamedClassLoader is a simple extension to URLClassLoader that adds a name and a destroy method that cleans up
027 * the commons logging and JavaVM caches of the classloader.
028 *
029 * @author Dain Sundstrom
030 * @version $Id: NamedClassLoader.java 517223 2007-03-12 14:02:22Z gnodet $
031 * @since 2.0
032 */
033 public class NamedClassLoader extends URLClassLoader implements DestroyableClassLoader {
034 private final String name;
035 private volatile boolean destroyed = false;
036
037 /**
038 * Creates a named class loader with no parents.
039 * @param name the name of this class loader
040 * @param urls the urls from which this class loader will classes and resources
041 */
042 public NamedClassLoader(String name, URL[] urls) {
043 super(urls);
044 this.name = name;
045 }
046
047 /**
048 * Creates a named class loader as a child of the specified parent.
049 * @param name the name of this class loader
050 * @param urls the urls from which this class loader will classes and resources
051 * @param parent the parent of this class loader
052 */
053 public NamedClassLoader(String name, URL[] urls, ClassLoader parent) {
054 super(urls, parent);
055 this.name = name;
056 }
057
058 /**
059 * Creates a named class loader as a child of the specified parent and using the specified URLStreamHandlerFactory
060 * for accessing the urls..
061 * @param name the name of this class loader
062 * @param urls the urls from which this class loader will classes and resources
063 * @param parent the parent of this class loader
064 * @param factory the URLStreamHandlerFactory used to access the urls
065 */
066 public NamedClassLoader(String name, URL[] urls, ClassLoader parent, URLStreamHandlerFactory factory) {
067 super(urls, parent, factory);
068 this.name = name;
069 }
070
071 /**
072 * Check if this classloader has been destroyed
073 * @return
074 */
075 public boolean isDestroyed() {
076 return destroyed;
077 }
078
079 /**
080 * {@inheritDoc}
081 */
082 public void destroy() {
083 synchronized(this) {
084 if (destroyed) return;
085 destroyed = true;
086 }
087 ClassLoaderUtil.destroy(this);
088 }
089
090 /**
091 * Gets the name of this class loader.
092 * @return the name of this class loader
093 */
094 public String getName() {
095 return name;
096 }
097
098 /**
099 * {@inheritDoc}
100 */
101 public String toString() {
102 return "[" + getClass().getName() + ":" +
103 " name=" + getName() +
104 " urls=" + Arrays.asList(getURLs()) +
105 "]";
106 }
107 }